Strong 6.3 Earthquake Near Port-Olry, Vanuatu
A strong magnitude 6.3 earthquake struck 197 km NW of Port-Olry, Vanuatu on Tuesday, October 20, 2026 at 04:20:38 AM UTC. This shallow crustal event (16.0 km depth) released energy equivalent to approximately 43 kt of TNT. Here is the verified US telemetry, live epicenter map, and ground shaking assessment.
(197 km NW of)Seismic Telemetry Specifications
6.3MWW
Strong Seismic Class
16.0km
Crustal Layer
13.991° S, 165.589° E
GPS Coordinates
43 kt
TNT Equivalent Power
US
USGS Real-time Feed
Epicenter Location & Tectonic Fault Map
Is This Earthquake Dangerous?
A magnitude 6.3 event is classified as a strong earthquake. Can be destructive in populated areas up to ~160 km from the epicenter. Well-built structures withstand shaking, but unreinforced masonry may suffer serious damage.
Estimated Shaking Across Nearby Communities
Felt by nearly everyone. Sleeping people awakened; small unstable objects overturned.
Felt by nearly everyone. Sleeping people awakened; small unstable objects overturned.
Did You Feel This Earthquake?
Help seismologists and community members map real-world ground shaking near Vanuatu.
Your immediate response verifies shaking boundaries and helps ground-truth instrumental models.
What Does Magnitude 6.3 Mean?
Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Logarithmic Energy Multiplier
Because seismic scales are logarithmic, each whole integer increase represents:
Why Did This Earthquake Happen?
Vanuatu's seismicity is fundamentally governed by its tectonic setting: Indo-Australian Plate subducting eastward beneath the Pacific Plate along the active New Hebrides Trench. Major regional fault structures include New Hebrides Trench, Central New Hebrides Fault Zone.
Originating at a depth of 16.0 km (Earth's Crust (0–70 km)), this rupture occurred occurred within the brittle upper crust. shallow earthquakes produce the highest peak ground acceleration and the sharpest surface shaking.
Aftershock Outlook & Secondary Tremors
Following an earthquake of magnitude 6.3, an active aftershock sequence is expected over the coming days and weeks. In accordance with Omori's Law and Båth's Law of seismology, secondary tremors decrease in frequency over time, with the largest expected aftershock historically averaging approximately 1.0 to 1.2 magnitude units below the mainshock. Local residents should remain vigilant for secondary shaking, particularly when inspecting older structures or unreinforced masonry.
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Earthquake Safety Action Plan
Complete Safety Guide →- •Drop, Cover, and Hold On: Take cover beneath a sturdy table or desk.
- •Stay indoors away from exterior glass windows and heavy unanchored fixtures.
- •If outdoors, move into an open area away from power lines and building facades.
- •Inspect utilities for damaged gas lines, water leaks, or electrical hazards.
- •Expect Aftershocks: Secondary tremors frequently strike after significant events.
- •Avoid damaged structures and listen to official emergency broadcasts.
- •Maintain a 72-hour emergency go-bag with water, food, and first aid.
- •Anchor heavy furniture, water heaters, and appliances to structural studs.
- •Establish a family emergency communication protocol and meeting point.
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